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Direct-current insulation monitoring device

A monitoring device and DC insulation technology, applied in the direction of measuring device, measuring electricity, power supply test, etc., can solve problems such as export relay misoperation

Active Publication Date: 2015-04-22
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a DC insulation monitoring device to solve the problem that the voltage fluctuation of the positive and negative busbars to the ground caused by the insulation monitoring device itself may cause misoperation of the outlet relay when switching the unbalanced bridge

Method used

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] A DC insulation monitoring device, the device includes a balanced bridge circuit and an unbalanced bridge circuit, the device also includes an intelligent adjustment circuit, the intelligent adjustment circuit includes a controlled current source and a switch device, the switch device is used to switch the controlled current source Connect between positive busbar and ground or between negative busbar and ground.

[0017] Based on the above technical solutions and in conjunction with the accompanying drawings, the following specific implementation is given.

[0018] The present invention comprises following several parts:

[0019] Balanced bridge circuit, unbalanced bridge circuit, intelligent regulation bridge circuit and leakage current sensor. The balanced bridge circuit is composed of a balanced resistor R1 connected between the positive bus CL+ a...

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Abstract

The invention relates to a direct current insulation monitoring device. The device comprises an intelligent adjusting circuit, and the intelligent adjusting circuit comprises a controlled current source and a switching device used for connecting the controlled current source between a positive bus-bar and the ground or between a negative bus-bar and the ground. The vector sum of current flowing through balance bridge resistors to the ground is detected in real time, if the vector sum of the current is plus, the controlled current source is connected with the positive bus-bar, if the vector sum of the current is minus, the controlled current source is connected with the negative bus-bar, and then the voltage, to the ground, of the positive bus-bar and the negative bus-bar is adjusted. In this way, it is prevented that when an unbalanced bridge is switched, the fluctuations of the voltage, to the ground, of the positive bus-bar and the negative bus-bar of the insulation monitoring device cause false action of an exit relay.

Description

technical field [0001] The invention relates to a direct current insulation monitoring device. Background technique [0002] With the development of smart grid, unattended substation is a big development trend. For this DC system, the requirements for its intelligence and reliability are also constantly increasing, and the reliability and safety of the DC power system directly affect the reliability and safety of the power system power supply. Such as figure 1 The main factors that endanger the reliability and safe operation of the DC system are: the ground fault of the DC system, the distributed capacitance of the DC bus to the ground (C+, C-, CJ) and Instantaneous fluctuations of DC bus voltage to ground, AC series faults, DC mutual series faults, etc. These factors will not only cause malfunction and refusal of relay protection devices, but also cause accidents on the primary side of the power grid, endangering the safe and stable operation of the power system. When t...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/40
Inventor 王永锋周登勇于海斌丁圆王佰超裴国强
Owner XJ ELECTRIC
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